On 11 Apr 2024, at 23:27, Baolin Wang wrote: > Currently, compaction_capture() does not allow lower-order allocations to > directly capture the movable free pages, even though lower-order allocations > might also be requesting movable pages, that can lead to more compaction > scanning. And, with the enablement of mTHP, such situations will become more > common. > > Thus allowing lower-order (mTHP) allocations of movable page types directly > capture the movable free pages can avoid unnecessary compaction scanning, > meanwhile that won't pollute the movable pageblock. With testing 1M mTHP > compaction, it can be seen that compaction scanning is significantly reduced. > > mm-unstable patched > Ops Compaction pages isolated 116598741.00 120946702.00 > Ops Compaction migrate scanned 1764870054.00 1488621550.00 > Ops Compaction free scanned 7707879039.00 4986299318.00 > Ops Compact scan efficiency 22.90 29.85 > Ops Compaction cost 73797.69 72933.48 > > Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> > --- > mm/page_alloc.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > LGTM. Thanks. Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> -- Best Regards, Yan, Zi
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